Google decorated their booth with their famous Google-labeled Lava Lamps. Their booth had several demonstration computers and a nice lounging area for working on laptops.
Part of the intent was obviously to recreate the feeling of a Google office. Google employees handed out fliers on job openings and answered a lot of employment questions from interested SIGGRAPH attendees.
If you want a Google Lava Lamp of your own, Google sells them at the Google Store.